Due to the increasingly serious problem of offshore oil spills, research related to oil–water separation has attracted more and more attention. Here, we prepared a super-hydrophilic/underwater super-oleophobic membrane (hereinafter referred to as BTA) using poly-dopamine (PDA) to adhesive TiO2 nanoparticles on the surface of bacterial cellulose, coated with sodium alienate by vacuum-assisted filtration technique. This demonstrates its excellent underwater super-oleophobic property. Its contact angle is about 153°. Remarkably, BTA has 99% separation efficiency. More importantly, BTA still showed excellent anti-pollution property under ultraviolet light after 20 cycles. BTA has the advantages of low cost, environmentally friendliness and good anti-fouling performance. We believe it can play an important role in dealing with problems related to oily wastewater.
Rare earth elements are widely exploited with the deepening of the dual carbon strategy, and it becomes especially important to recover residual rare earth elements as a strategic resource. In the present experiments, we have found that silk gliadin has a variety of strongly polar side chains that allow easy cross-linking, copolymerization and blending with other polymers, and in addition we have found that sodium alginate can form honeycomb-like porous structures at certain ratios. Therefore, it is proposed to use silk glue protein and sodium alginate as precursors to functionalize modified cellulose nanocrystals, combined with ion imprinting technique to construct porous imprinted aerogels and apply them to the selective adsorption of gadolinium ions. The successful synthesis of the material was demonstrated by relevant characterization, and the results of static adsorption experiments showed that the maximum adsorption capacity was 93.41 mg g− 1 at pH = 7.0. Sodium alginate provides a stable honeycomb 3D structure and silk gum provides a large number of adsorption sites, providing a viable direction for green porous sustainable adsorbent materials.
Gadolinium is widely applied in medical and high-tech materials because of special magnetic properties. Recovery of gadolinium from waste rare earth products has both economic and environmental value. In this experiment, honeycomb porous composite aerogels were constructed using silk gliadin and sodium alginate mixed with functionally modified carboxymethylated cellulose nanocrystals for the adsorption and separation of gadolinium ions. There were large numbers of carboxyl groups as well as hydroxyl groups existing on the surface of sodium alginate and filamentous protein, which provided more sites for the adsorption of gadolinium ions. Besides, a stable honeycomb structure appeared on the surface of composite aerogels when the mixture of filamentous protein and sodium alginate was 1:1, which increased the specific surface area of materials to 140.65 m2 g− 1. Additionally, the imprinted composite aerogels Ic-CNCs/SSA were prepared by virtue of the imprinting technology, enhancing the adsorption selectivity of composite aerogels for gadolinium. The adsorption experiments revealed that the maximum adsorption capacity of Ic-CNCs/SSA reached 93.41 mg g− 1 at pH 7.0, indicating good selective adsorption of gadolinium ions. In summary, such composite aerogels provide great potential and reference value for the selective adsorption of gadolinium ions in industry.
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